// file version
#pragma once

#include "../comm/log.hpp"
#include "../comm/util.hpp"

#include <iostream>
#include <string>
#include <unordered_map>
#include <cassert>
#include <vector>
#include <fstream>
#include <stdlib.h>

// 根据题目list文件，加载所有题目信息到内存中
// model: 只要用来和数据进行交互，对外提供访问数据的接口

namespace ns_model
{
    using namespace ns_log;
    using namespace ns_util;

    class Question
    {
    public:
        std::string number; // 题目编号
        std::string title;  // 题目标题
        std::string star;   // 题目难度 简单 中等 困难
        int cpu_limit;      // 题目的时间要求(S)
        int mem_limit;      // 题目的空间要求(KB)
        std::string desc;   // 题目的描述
        std::string header; // 题目预设给用户在线编辑器的代码
        std::string tail;   // 题目的测试用例，和header拼接形成完整代码
    };

    const std::string questions_list = "./questions/questions.list";
    const std::string questions_path = "./questions/";

    class Model
    {
    private:
        // 题目 : 题目细节
        std::unordered_map<std::string, Question> questions;

    public:
        Model()
        {
            assert(LoadQuestionList(questions_list));
        }

        bool LoadQuestionList(const std::string &questions_list)
        {
            // 加载配置文件：questions/questions.list
            std::ifstream in(questions_list);
            if (!in.is_open())
            {
                LOG(FATAL) << "加载题库失败，请检查是否存在题库文件" << "\n";
                return false;
            }

            std::string line;
            while (getline(in, line))
            {
                std::vector<std::string> tokens;
                // 分割字符串
                StringUtil::SplitString(line, &tokens, " ");
                // 1 判断是否是回文串 简单 1 30000
                if(tokens.size() != 5)
                {
                    LOG(WARNING) << "加载部分题目失败，请检查文件格式" << "\n";
                    continue;
                }
                
                Question q;
                q.number = tokens[0];
                q.title = tokens[1];
                q.star = tokens[2];
                q.cpu_limit = atoi(tokens[3].c_str());
                q.mem_limit = atoi(tokens[4].c_str());

                std::string path = questions_path;
                path += q.number;
                path += "/";
                FileUtil::ReadFile(path + "desc.txt", &q.desc, true);
                FileUtil::ReadFile(path + "header.cpp", &q.header, true);
                FileUtil::ReadFile(path + "tail.cpp", &q.tail, true);

                // 把题目信息插入到questions映射里
                questions.insert({q.number, q});
            }
            LOG(INFO) << "加载题库...成功!" << "\n";
            in.close();
            return true;
        }

        bool GetAllQuestions(std::vector<Question> *out)
        {
            if (questions.size() == 0)
            {
                LOG(ERROR) << "用户获取题库失败" << "\n";
                return false;
            }
            for (const auto &q : questions)
            {
                out->push_back(q.second);
            }
            return true;
        }

        bool GetOneQuestion(const std::string &number, Question *q)
        {
            const auto &iter = questions.find(number);
            if (iter == questions.end())
            {
                LOG(ERROR) << "获取题目失败，题目编号：" << q->number << "\n";
                return false;
            }
            *q = iter->second;
            return true;
        }

        ~Model()
        {
        }
    };
}